Interest-calculator.



No. 892,526. PATENTED JULY '7, 1908. M. KATZ.

INTEREST CALCULATOR.

APPLIUATIGN FILED NOV.28,1906.

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MOSES KATZ, OF DORNA WATRA, AUSTRIA-HUNGARY.

INTEREST-CALCULATOR.

Specification of Letters Patent.

Patented July '7, 1908.

Application filed November 28, 1906. Serial No. 346,552.

To all whom it may concern:

Be it known that I, Moses KATZ, private clerk, a subject of the Emperor of Austria- Hungary, residing in Dorna l'Vatra, Bukowine, Austria-Hungary, have invented new and useful Im rovements in Interest-Calculators, of whic the following is a specification.

This invention relates to improvements in interest calculating machines designed to calculate the amount of interest due upon a given amountor sum for a given period of time.

The invention will be more fully described in connection with the accompanying drawing and will be more particularly pointed out and ascertained in and by the appended claims.

In the drawing-Figure l, is a view in front elevation of a calculator embodyi the main features of my invention, sai figure showing parts broken away to illustrate internal mechanism. F ig. 2, is a plan view of the same with parts broken away. Fig.- 3, is a sectional view on line 33 of Fig. 1.

Like numerals of reference designate similar parts throughout the different figures of the drawing.

As shown the calculator com risesa casing, designated as a whole by l, and rear, end, and top and bottom walls. The front wall, which is designated at 2, is provided in its upper part with a pluralitv of elongated openings 3 disposed in parallel relation and extending horizontally substantiallv throughout the length of said well. Said openings are spaced apart from each other uniformly to provide intervening casing strips 23, there being eleven strips and twelve openings herein shown. The names of the twelve calendar months are disposed opposite said strips at the left of the calculator upon a surface 24 provided for this purpose. ,(ln each of said strips alining with g the names of the months is disposed at plurality of numerals spaced apart from each having front,

other uniformly and extending from points stationary. Movable means is provided and is associated with said stationary means or strips and there is disposed upon said movable means a plurality of numerals arranged in parallel rows in a. manner to be exposed through the openings 3 which numerals range from 1 to 365. Said numerals upon the movable means are disposed in rotation so that the smaller numbels will appear at the left hand extremities of the slots 3 and if desired vertical lines of division may be pro vided on said stationary and movable means to visually assist the operator in bringing the numbers of the movable means into register with the numbers on the stationary means. As shown said movable means consists of a Web 8 trained at its op osite ends about two rollers 7 and inasmuc l as said web hears numerals indicating the days or dates it will hereinafter be termed the date Web.

Convenientlv the casing '2 is divided bv a partition 6 and the rollers 7 are mounted in said partition at their lower ends and in the it per wall of the casi at their upper ends. .lechanism is providet for operating said rollers 7 in unison and in the same direction with respect to each other and as shown said means consists of a. shaft 9 provided with a crank 11 and bevel gears 10. adapted to mesh with bevel gears 12 which latter are mounted on said rollers. Said shaft S) is mounted in bearings 25 secured to the top wall of the casing l. The front wall 2 of said casing is provided with an opening 4 for the purpose of disclosing the dates u )Ofl which the loan has been made and a p urality of loaning dates are provided which in the embodiment shown are disposed upon the upper margin of the date web so that thc loaning dates will always be maintained in prcscri bod relation with respect to the dates between the strips 23. The loauin dates on tho web 8 consist of the month and day of tho mnnt it throughout the calendar your. As the numerals on the web H. 'lllf'll an exposed through the o )onings 3, indicate tho prllml of time of the loan said uuum'nls will hereinafter he referred to as the time du-tos and as adjacent the names of the months to the right of the casing, said numerals indicating the number of days in each month and being fixed upon a part of the casing and therefore I the numerals on the strips 2:; designatitho time at which the loan is to he paid. or when interest is to he paid. said numerals will horoinaftor be referred to as the pavuu-ut dates.

The lower portion of the casing is provided on the front wall 2 with a plurality of elongated openings 26 through which are dis closed i re sums of interest. Immediately below said openings 26 there is disposed parallel lines of numerals indicating the amount I or amounts loaned and said numerals will hereinafter be termed the loaned numerals or indications. There are 10 openings 26 shown and 10 commercial rates of interest are d signated in columns 27 at the right and left of openings 26 and in registrv therewith.

0 Movable means are provided, which as shown are individual with respect to the openings 26, for disclosing the amount of money due as interest and as shown said movable means 1 consists of a pluralit of webs 15 mounted rollers provided with retaining means and on which webs the interest sums or amounts are disposed and said upon spring actuate webs will therefore hereinafter be termed interest webs. Each of said webs 15 is provided with a series of numerals designated at I 28 to indicate the period of time of the loan. Rollers 29 are mounted abreast of the openigs 26 and said rollers are provided with ratchet-wheels 30 and operating knobs 19.

Spring pawls 31 engage said ratchet-wheels and prevent the rollers 29 from being rotated after they had been adLustod and before the are leased by said aw 31. The webs 15 at one end are woun about the rollers 29 and at their other ends about spring actuated rollers 14 which are constructed as follows: Roller spindles 17 are mounted in the end walls of the casing l and spiral springs 18 are wound about said spindles and are secured thereto at one end. The ends of said rollers 14 are mounted in sockets 16 which are loosely mounted on said spindles and the opposite ends of said springs are secured to said socket. It will thus be seen that the knobs 19 are turned against the resistance of the spri s 18 and that when the spring pan is 31 are re eased the springs 18 will automatically return the webs 15 to a zero position. Guides 22 are provided for the webs 15 and similar guides 13 are provided for the web 8 so as to retain said webs in close proximity to the openings so that the subject matter on said we bs will be efi'ectively exposed. As shown only two sets of rollers 14 and 29 are illustrated but. it will be obvious that in practice one set will be required for each o )Plllllg 26.

Assuming that it is desired to calculate the interest due on the sum of $100.00 loaned December 31st. and payable January 11th. (the following year) with. interest at 9% the crank l 1 will be operated to bring the loaning date December 3151. into an exposing )l)Sition with rcsim-t to the o inning 4am this movement o the web will bring the time date or numeral 11 into registry with the l payable date 11 of the January strip 23 1 thereby disclosing to the operator the fact that the loan has been made for eleven days. l in order to determine the amount of interest due on an eleven day loan oftilUtLOO at 9 2, the operator will rotate the knob 19 adjacent the 9% designation in the column 27 until the figure 11 appears in the opening 26 whereupon the o eratcr will refer to the loan numerals be ow the lowermost slot 26 where he can locate the sum loaned, which in this i case is $100.00, and immediately above this loan indication there will be indicated on the 1 strip 15 the amount of money due as interest which in this case will be $.27, as indicated above the sum of $100.00.

l. A calculator comprising in combination a casing provided with fixed means on which payment dates are dis osed and an opening or disclosing loanin ates, movable means on which is disposed loaning dates adapted to be exposed throu h said opening and time dates adapted to e brought in re istry with said pa ment dates, said casing eing provided wit names of the calendar months opposite said payment dates and with columns bearin rates of interest web openings individual 0 said rates of interest, loan numerals disposed below said openings interest 3 webs individual to said openings and bearing interest amount-s correspondin to said loan numerals, each web bein provided with numerals 28 for indicating 51c time of the loan, automatic means normal] tendin to return the webs 15 to a zero position, an retainin means normally preventing the operation 0 said automatic means.

2. A calculator comprisin incombination,

a casing provided with fixe means on which ayment dates are dis used and an opening or disclosing loanin dates, movable means on which is dispose loaning dates adapted to be ex osed throu 11 said opening and time dates a aptecl to be brou ht in re istry with said aymentdates, said casing being pro- \ltlMFWltli the names of the calendar months opposite said paymentdates and with a column bearing rates of interest, web openings individual to said rates of interest, loan nu merals disposed below said openings, and interest webs individual to said openings and .bearing interest amounts corresponding to said loan numerals, each web being' provided with time loan numerals for indicating the time of the loan.

3. calculator comprising in combination, fixed means on which payment dates are disposed and means for disclosing one of a series of loaning dates, movable means on which is disposed loaning dates and time dates, said time dates being adapted to be brought in registry with said payment dates, mcuns dis- 5 merals a 'closing tl enames of the calendar months ad means being provided with time 101m numerjacent snid payment dates, means disclosin retesoffinterst, openings individual to sai rates ofinterest, means dlsclosln loan numeans iy jdual to said oipen'ings beating mterest- -einonnts correspon m to said loaln numera 5, each of said indivifiual movable (iacent said openings, an movable als for indicating the time of the loan.

In testimony whereof I affix mysigneture "in presence of two witnesses.

MOSES KAIZ. Witnesses:

ALFRED DEABEN, ALvns'ro S. Homm. 

